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nullity - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

From Middle French nullité, from Medieval Latin nullitas, from Latin nullus.

nullity (countable and uncountable, plural nullities)

  1. The state of being null, or void, or invalid.
    nullity of marriage
  2. (law) A void act; a defective proceeding or one expressly declared by statute to be a nullity.
  3. (mathematics) The dimension of the kernel of a linear transformation; the dimension of the nullspace of a matrix.

the state of being null, or void, or invalid

the dimension of the nullspace of a matrix